Introduce BlockInfoUnderConstruction to reflect block replica states while writing.
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Key: HDFS-517
URL: https://issues.apache.org/jira/browse/HDFS-517
Project: Hadoop HDFS
Issue Type: Sub-task
Components: name-node
Affects Versions: 0.21.0
Reporter: Konstantin Shvachko
Assignee: Konstantin Shvachko
Fix For: Append Branch
Currently when a block is created its locations are stored in {{INodeFileUnderConstruction.targets}},
which correspond to the last allocated block. With the new append design we will need to keep
track of block replicas for several blocks rather than just the last one.
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